The research of loop unrolling for coarse-grained reconfigurable block encryption array

Coarse-grained reconfigurable block encryption array (REBA) provides massively parallel computing resources but traditional mapping scheme does not develop the advantages of REBA. In this paper, aiming to improve the performance and resource efficiency of algorithm mapping, we research the structure of familiar block cipher algorithm, and propose the speed-up model based on loop unrolling and the modified strategy of unrolling in resource-constrained situation. Experimental results show that the proposed scheme develops the advantage of parallel resources that has 25-55 times higher throughput and 3-11 times higher throughput per unit of array area than the traditional scheme. Compared with other methods, our scheme has a higher performance-area ratio and smaller solving complexity.